Dodecylbenzenesulphonic acid

Other distribution data

Administrative data

Endpoint:

other distribution data

Type of information:

other: published data

Adequacy of study:

supporting study

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

study well documented, meets generally accepted scientific principles, acceptable for assessment

Justification for type of information:

Sodium dodecylbenzenesulfonate (CAS No. 25155-30-0, EC Number; 246-680-4) is a very close analogue of the dissociated acid because it readily dissociates in water and release the dodecylbenzene sulfonic anion in solution.

Data source

Reference

Reference Type:

publication

Title:

Sorption of sodium dodecylbenzene sulfonate by montmorillonite.

Author:

Yang K and Zhu L and Xing B

Year:

2007

Bibliographic source:

Environ. Pollut.145: 571-576.

Materials and methods

Test guideline

Qualifier:

no guideline followed

Principles of method if other than guideline:

Sorption of Sodium dodecylbenzene sulfonate(SDBS) by montmorillonite was determined by a batch technique at room temperature (25 +/-1 deg C) . A total of 20 mL solution containing different amounts of SDBS and 0.50 g of the solid sample with or without NaCl were added to 50 mL Erlenmeyer flasks with glass stoppers and shaken on a gyratory shaker at 150 rpm for 12 h to reach equilibrium. After equilibrium, the solid and the aqueous phases were separated by centrifugation (4000 rpm) for 30 min. The concentrations of SDBS in the aqueous phase were determined by HPLC. The sorption was calculated by the difference from initial and equilibrium SDBS concentrations. For investigating the effect of concentrations of Ca2 + montmorillonite on the sorption of SDBS, the added amounts of solid sample were 0.25 g, 0.50 g and 1.00 g to obtain Ca2?montmorillonite concentrations of 12.5 g/L, 25.0 g/L and 50.0 g/L, respectively. Precipitation between SDBS and Ca2+ was also determined by batch technique at room temperature (25 +/-1 degree C) . A series of solutions, each with the same concentration of CaCl2 but with various SDBS concentrations, were added to 50 mL Erlenmeyer flasks with glass stoppers and shaken on a gyratory shaker at 150 rpm for 12 h. Then, the solid and the aqueous phases were separated by centrifugation (4000 rpm) for 30 min. The concentrations of SDBS in the aqueous phase were analyzed by HPLC. The precipitation quantity was calculated by the difference between initial and equilibrium SDBS concentrations.

GLP compliance:

not specified

Type of study:

other: Sorption

Media:

other: montmorillonite

Test material

Test material information

Constituent 1

Reference substance name:

Sodium dodecylbenzenesulfonate

EC Number:

246-680-4

EC Name:

Sodium dodecylbenzenesulfonate

Cas Number:

25155-30-0

Molecular formula:

C18H29NaO3S

IUPAC Name:

sodium dodecylbenzenesulfonate

Test material form:

solid: compact

Details on test material:

Sodium dodecylbenzenesulfonate (CAS No. 25155-30-0, EC Number; 246-680-4) is a very close analogue of the dissociated acid because it readily dissociates in water and release the dodecylbenzene sulfonic anion in solution.Sodium dodecylbenzene sulfonate (SDBS), with a purity of 95%, was purchased from Tokyo Kasei Kogyo Co., and used without further purification. Its average molecular weight is about 349 g/mol. The critical micelle concentration (CMC) of SDBS determined in this study was about 963 mg/L.

Applicant's summary and conclusion

Conclusions:

Sodium dodecylbenzene sulfonate will tend to partition to positively charged substrates in soils and sediments.

Executive summary:

In this study, batch experiments were conducted to elucidate the sorption of a widely used anionic surfactant, sodium dodecylbenzene sulfonate (SDBS), by montmorillonite. It was observed that: (i) SDBS was sorbed significantly by montmorillonite saturated with Ca2+, but little by Na-saturated montmorillonite; (ii) the amount of SDBS sorbed by Ca2 + montmorillonite was enhanced by NaCl; and (iii) no significant intercalation of SDBS into Ca2+ montmorillonite was observed by X-ray diffraction (XRD) analysis. These results indicate that the removal of SDBS by Ca2+ montmorillonite was primarily attributed to the precipitation between DBS- and Ca2+ in solution which was released from montmorillonite via cation exchange.